Well I installed my DC 4-1 tonight and the problem is ..The collector is 2.5 and my ca is like 2.25 so it halfway fits but is extremely loud!! Its basicaly just resting agisnt it. What do you guys think I should do here ?? I dont wanna buy a new cat. .maybe go to auto zone and get a resonator ? But what size would i need to fit OVER 2.5 and then the other end would have to fit over or in 2.25 ? Thanks

 

comn on now

 

You can get a catco high flow cat for 100 bucks at summit racing...its a direct bolt in not sure if it will fit the header though but it works great.